HOUSTON (AP) — The reinstated catcher from the and put him in the lineup against the Detroit Tigers on Tuesday night.
Diaz has been out for more than two months with an oblique strain after he was hurt during batting practice.
The Astros also reinstated right-hander , designated righty Jayden Murray for assignment and optioned catcher Collin Price to Triple-A Sugar Land.
Brown went on the IL with a shoulder strain in April, a year after he won 12 games with a 2.43 ERA.
The 29-year-old Murray had a 7.43 ERA in eight games this season. The 26-year-old Price was 2 for 12 in seven games this year.
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